قالَ رَسُولُ اللّهِ (صَلَّى اللّهُ عَلَيْهِ وَ آلِهِ وَسَلَّمَ): لِكُلِّ شَيْءٍ حِلْيَة وَ حِلْيَةُ الْقُرآنِ الصَّوْتُ الْحَسَنُ.
The Messenger of Allah (blessings of Allah be upon him and his family) has said: “For every thing there is an embellishment (or a decoration), and the embellishment of the Qur’an is a good voice.”
Biharul Anwar, Volume 92, Page 190